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BY:RAJAN KR. GUPTA

1BI09EE041

DEPT. OF E.E.E

IN CHARGE:SWARNALATHA SRINIVAS

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BLOCK DIAGRAM:

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TOUCH SCREEN:

tiny sensors detect pressure from finger/pointing device.

TYPES OF TOUCH SCREEN:

RESISTIVE TOUCH SCREEN. CAPACITIVE TOUCH SCREEN.

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RESISTIVE TOUCH SCREEN:

WORKING:

pressure is applied.

layers are pressed

together.causing a change in

the electrical current.

touch event isregistered by touchscreen controller.

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ADVANTAGES:

Control is safe and simple.danger of electric shock is eliminated.

The power consumed is low.

More reliable

long life.

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DISADVANTAGES:

very difficult to read the screen in sunlight.

have to be within arms reach of the device

High cost.

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PROGRAMMABLE SYSTEM ON CHIP(PSOC):

family of integrated circuits made by CypressSemiconductor.

These chips include a CPU and mixed-signal arrays

configured with integrated analog and digitalperipherals.

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Interface of 4 Wire Resistive Touch screen with PSOC

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NECESSITY OF PSOC:

Touch screen controller need MUX+PGA +ADC

MUX+ PGA + ADC are inbuilt.

Inbuilt clock frequency, so no need external crystal.

To know the axis of Touch screen PSOC is interfaced with LCD.

Three requirements of touch screen are

1) X position

2) Y position

3) Touch Pressure Z of both X & Y position

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FLOWCHART:

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TRANSMISSION OF SIGNAL:

coding and programming is done in the PSOC

the signal is send by Encoder.

Similarly to receive the signal an decoder is used. it will convert digital data into frequency.

Radio Frequency Transmission is used which has433.3MHz and around 2km of distance.

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COMPLEX PROGRAMMABLE LOGIC DEVICE(CPLD):

Provide the benefits of high integration levels. can be designed and verified quickly.

software configured and field programmable.

Users can modify their designs very easily.

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555 TIMER CIRCUIT:

For reset or as oscillator for CPLD, 555 timer is used

DESIGN:

Charging Time = 0.693 * R1R2*C Discharging Time= 0.693 * R2*C

Period= 0.693 * (R1 + 2R2)

Frequency= 1.44/ (R1 + 2R2) C

R1 =1 K, R2 =10 K, C=0.001 F

Frequency= 68 kHz

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ZERO CROSSING DETECTOR(ZCD):

The ZCD circuit is connected to CPLD The gate pulses for the TRIAC circuit are designed by

Zero Crossing Detector ZCD circuit.

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WAVEFORMS:

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TRIAC CIRCUIT:

component which is essential in controlling powerfrom an AC source (mains)

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SPEED CONTROL OF AC MOTOR:

VOLTAGE CONTROL METHODS:

VOLTAGE IS CONTROLLED BY

ADJUSTING FIRING ANGLE.

DUE TO CHANGE IN VOLTAGE

SPEED IS CHANGED.

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CPLD AND TIMER INTERFACE:

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